Cylinder for rotary printing-presses.



W. L. HAMILTON. CYLINDER FOR ROTARY PRINTING PRESSES.

Mfilneses:

THE NORRIS PETERSCQ, PHOTO-L!THO., WASHINGTON. D. C.

WILLIAM L. HAMILTON, 01E CHICAGO, ILLINGIS, ASSIGNOR 0F GITE-THIIIRD TO LOUIS K. GILLSGN, 012 WILMETTE, ILLINOIfi, AND ONE-SIXTH. TO GHAILTIIES B. GILLSON, OF

CHICAGO, ILLINOIS.

CYLINDER FOR ROTARY PRINTING-PRESSES.

Specification of Letters Eatent.

Patentednpr. 13, 1915.

Application filed December 23, 1912. Serial No. 738,259.

To all whom it may concern:

Be it known that 1, WILLIAM L. HAMIL- TON, a citizen of the United States, and resident of Chicago, county of Cook, and State of, Illinois, have invented certain new and useful Improvements in Cylinders for R0- tary PrintingPresses, of which the following is a specification and which are illus trated in the accompanying drawings, forming a part thereof.

The invention relates to the cylinders of rotary printing presses and particularly to those of the form shown in my patent for rotary printing press, No. 1,008,737, dated September 19, 1911, wherein each cylinder has printing and impression surfaces of different radius. In such printing presses the tympan surface of each cylinder is of less radius than the printing surface thereby permitting the tympan surface to pass the'form rollers.

The present invention has for its object to provide a printing cylinder of the type described, which shall be easily manufactured and shall be efiective in operation.

Tn the accompanying drawings Figure l is a detail central longitudinal sectional view of a rotary printing press showing cylinders of the form provided by the invention, and, Fig. 2 is a perspective view of one of the cylinders.

The printing press illustrated in Fig. 1 of the drawings comprises the two feed boards 10 and 11, the two cylinders 12 and 13 and the two sets of form rollers 14: and 15. In constructing the press a sheet delivery mechanism of the form illustrated in my said patent No. 1,003,737 will preferably be employed, but it has been deemed unnecessary to show this herein.

The two cylinders 12, 13 are preferably corresponding set of form rollers 141, 15 with- .out being engaged thereby, the cylinders are so constructed that when the tympan portion 17 is covered with the usual packing 19v and the I printing portion 16 is supplied with printing plates 20 the effective radius of the tympan portion 17 is less than that of the printing portion 16. This arrangement re quires that the interineshing cylinder gears as 18 shall be of irregular outline, their pitch lines following the irregular effective contour of the cylinders, whereby the cylinders are rotated at relatively variable angular velocity, and the surface speeds of the printing plate on each cylinder is uniform with the surface speed on the tympan of the other cylinder when said surfaces are in contact, all as fully disclosed in my said patent No. 1,003,737.

In carrying out the present invention the body portion of each of the cylinders 12, 13 is made of uniform radius throughout its circumference and the difference in the effective radius of the printing and the impression portions is obtained by the use of the printing plates 20 and packing 19 which are of different thickness, the packing 19 preferably being the thinner. As shown the part 16 of each of the cylinders 12, 18 is provided with oblique slots 21 for receiving plate fastening hooks 22. These plate fastening hooks may be of any usual form of construction. They are accordingly not illustrated in detail in the drawings. The part 17 of the body portion of each of the cylinders 12, 13 is preferably made smooth for reception of the packing 19. The usual tympan reels 23 are provided upon each cylinder adjacent to part 17 for stretching the packing 19 and grippers 241 are provided for holding the sheets to be printed against the packing.

In the operation of the press, sheets to be printed are fed alternately from the two feed boards 10, 11, each sheet being fed to the grippers 241 of the corresponding cylinder 12, 13. The printing plates 20 upon the printing portion 16 of each cylinder are supplied with ink as they pass beneath the corresponding set of form rollers 11, 15 and then print a sheet against the tympan portion 17 of the other cylinder. The packing 19 passes beneath the corresponding set of form rollers 14, 15 without being engaged thereby, by reason of its being of less thick ness thanarethe printing plates It has beenv found by experiment that if printing plates 3/16 of-aninch in thickness areem ployed, packingof the usual thickness of about 25/1000 of an inclrmay be employed without being engagedby the form rollers V 14,- 15, while still permitting the two parts of the cylinder body against which the plates and packing 19 are respectively held to be of the same radius. By means of this arrangement the body portions of the cylinders 12, 13 may be finished in a lathe without the necessity of moving the. finishing tool back andforth as it comes into engagement with v the two parts of the cylinder.

a. I claim as my invention A printing devlce comprlsing 1 drical body having a surface of uniform radiusthroughoutand a part of such'surface being constructed for the reception of a printing plate and a differentpart of such surface being constructed for the. reception of a tympan, the said printing plate and tympan to be superposed upon the respective portions'of the cylindrical body and each in- V creasing the effective radius of thesaiol part of the body to which it isfapplied but in different amounts.

QQA printing device comprising acylindrical body having a surface of uniformrad us throughout, and a-printing plate and 1 tympan ofdifferent thickness superposed 1 ness ofthe tympans and printing plates be-' upon different parts of the cylindrical surface of the said body.

In a rotaryprinting. press, in combination, a pairof equal parallel cylinders each having its surface pconformlng to afitrue sing unequal, and means for rotating the cyla cylininders atrelatively variable angular velocity whereby the surface speeds of the printing I plate and tympan on each cylinder will alternately be uniform with the surface speeds of the tympan and printing plate on the other cylinder respectively.

4. In combination, a pair of oppositely rotating cylinders each having a surface of uniform radius throughout, a part of the surface of each cylinder being constructed for the reception of a printing plate and a different part of the surface of each cylinder being adapted to serve .as a tympan, the printing plates to be superposed upon the said parts of the two cylinders for increasing the effective radii of the surfaces to which they are respectively appliedbeyon'd the effective radii of the saidparts which are .adaptedto serve as tympans, and the printing plate which is applied to each cylinder coacting with the said part of the other cylinder which is adapted to serve as a tympan. c

5. A printing device comprising a cylindrical body having a surface of uniform radius throughout, and a part of such surface being constructed for the reception of a printing plate and a different part of such surface being constructed for the reception 'of a tympan, the saidprinting plate and tympan to be superposed upon the respective portions of the cylindrical body and each increasing the effective radius of the said part of the body to which it is applied but in different amounts, and means for rotating the cylindrical body at different speeds which are relatively in the same proportion as theeffective radii of the said two parts of the body.

. WILLIAM L. HAMILTON.

Witnesses:

ANTHONY. J CAssrN, WM. J. LEONARD.

' Copies of this patent may be obtaind forfive cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

